Beetlejuicing is an internet phenomenon that occurs when a user posts a comment or thread and another user with a perfectly relevant username appears to reply. The term is derived from the 1988 film Beetlejuice, in which the eponymous character is summoned after his name is spoken three times. Predominantly popularized on Reddit, there is an entire subreddit dedicated to documenting these occurrences. To qualify as a 'true' beetlejuice, the account usually must be established for a significant amount of time to prove it wasn't created just for the specific joke. It represents a rare, serendipitous moment of digital coincidence that remains a staple of forum culture.